OPERATION OF MEDIUM WRECKER (Contd)
Crane Operation. The medium wrecker crane is capable of rotating 360, extending its boom 18 feet (5.5
meters) and elevating the boom to 45°. A data plate above crane controls lists variations in safe load crane extension and
how it is rigged. Maximum capacity is 20, 000 pounds (9, 080 kilograms) with three-part line.
Gondola safety guard must be in place prior to crane operation.
Whenever possible, position wrecker for a direct rear lift.
This operation requires two crewmembers.
Vehicle equipped with auto throttle will automatically idle between 1350 and 1400 rpms.
Set CTIS to SAND mode after outrigging (M936A2 model vehicles).
Park wrecker on a level, hard surface if possible. Wrecker position depends upon type of lifting operation
such as rear lift, side lift, or lift and swing.
Position outriggers (10) as follows:
Remove retaining clip (15) holding L-shaped retaining pin (14) at corner of outrigger frame tube (16) and
remove pin (14).
Pull outrigger (10) out until it stops and lower to a vertical position.
Insert outrigger handle (12) into hole in collar (9).
With crewmember holding collar (9), grasp outrigger base (11) and turn counterclockwise until base (11)
makes contact with ground.
Turn collar (9) clockwise until base (6) seats against ground. (f) Repeat procedure to lower remaining
Start engine (para. 2-12).
Place transfer case shift lever (4) in neutral.
(5) Unlock safety latch (5) and engage power takeoff lever (6).
(6) Place transmission selector lever (2) in 1-5 (drive).
(7) Pull out hand throttle control (1) on M936/A1 to last stop.
(8) If tactical situation permits, turn on amber warning light switch (7), if required, and floodlight control switch (3) if
operation is at night.
To obtain required lift, adjust shipper braces (17):
(a) Remove retaining clips (19) securing T-shaped retaining pins (18) to shipper braces (17).
(b) Raise boom (8) to required height by pulling boom control lever (13) back
Adjust height until holes in male and female sections of shipper braces (17) are aligned.